Drilling mechanism



se t. 22, 1931.

E. G. GARTIN DRILLING MECHANISM Filed Oct. 27, 1924 Azzy.

Patentecl ept. 22, Q

UNIT D STAT S PATENTOFFICE EILMERG. GARTIN, OF cmmmom, NEW HAMPSHIRE,'AssIGNon'ro sULL IvAN En CHINERY'COMPANY; .A CORPOBATION OFMASSACHUSETTS v DBILLING MEHANISM- Application filed October 27, 1924..Seria1' No.- 746342..

My -invention, relates to drilling mechanisms. i e i i An object of myinvention is to provide an improved drillingmechanism. `Another objectof my invention is to provide improved hole oleansing means for such amechanisnn Still another object of my invention is to provide improvedcontrolling means for the fluid distribution valve 'of a pressure fluidpercussive drilling mechanism `whereby the' distribution valvemay beh'eld in one position to direct the flow of pressure fluid only to theforward end of the motor holdingthe hammer piston in its extremerearward position and directing a supply of pressure fluid to the hollowdrill steel' to cleanse the hole. Still another object of my inventionis; to provide improved pressure fluid operated means for controllingthe distribution valveof a dri11- ing mechanism to accomplish the abovefunction. These and other objects andadvantages of my invention will;however, hereinafter more fully appear.

In the accompanying i i shown for purposes ofillustration two formswhich my invention may assume in practice. e i

In these drawings,'-- e e v o Fig. 1 is a side elevation of adrillingmechanism in which my improved valve controlling and hole cleansingmeans is embodied,

the view being shown partially in centrali longtudinal Vertical section.

Fig. 2 is an end elevational view of the mechanism shown in Fig. 1'.

Fig, 3 is a developed longitudinal sectional view taken substantially online 3-3 of Fig. 2. i

Fig. 4 is a sectional view similar to that shown in Fig. 3 of a modifiedform of construct ion; v 4 In the illustrative form of my inventionshown in Fgs. 1 to 3 I haveshown aldrilling mechanisnngenerallydesignated l`, coniprising a cylinder 2 having a`bore`3 i`n whichdrawings I have a hammer piston 4 is reciprccableQ The hammer piston 4is provided with' a forwardly projecting striking bar 5 adapted toactuate a hollow drill steel 6 carried by the forward end oi' thedrilling mechanism, in a well known manner. The forward end of thecylinder 2 is adapted to have intermittent communica'tion with the boreof the drill steel Grand which communication is controlled by thes'triking bar' 5 which is provided with the usual drill steelrotationflutes 5 The upper surface of the cylinder 2 has a valve chest7, of a well known form, formed sthereon having a ,longitudinallyextending bore` 8 formed therein adapted to receive oppositely disposedsleeves 9 and 10 of identical construction. The sleeves 9 and 10 areeach provided with stepped bores 11 and 12, the bores 11 havingtheirouter ends closed by usual 'ventedbufferplugs 13 and 14. The sleeves 9and 10" and bufier plugs 13 and 14 are held in operative assembledrelation by means of the usual transverse springs 15 and. 00-

Operating ;side irods 16, in a well known manner. 'AT fluiddistributionvalve 17, herein of the well' known three-spooldifl'erential type, is disposed within the bores 11 and 12 formed withinthe sleeves49 and 10 and is adapted to alternatelycontrol the supply ofpressure fluid to the drilling motor 'rom ta suitablesupply passage 18by; means ot the usual manxer.` 'Usual valve throwing or 'kiker passages23 and 24 are provided which communicate at longitudinally. spacedpoints with the cylinder bore '3 and with the bloresll, at the oppositeends of the valve 17 by* means' of passages 25-and 26 formed inthesleeves 9 and 10 respectively, .A throt tle valve, generally designated27, "of an aol a passage 61 which is adapted to connect the bore 49formed in the plug 13 with the forward end of the bore 53 whichcommunicates with the bore 41. The bore 53 is provided with a laterallyextending. vent port 62 which is adapted to connect the forward end ofthe bore 41 with the atmosphere when the valve 57 is in itsino-perative-position; It will herein be noted that the stem 43 of thepiston 42 is flattened or cut away at 63 to vent the end of the valve 17in the usual manner to the atmosphere 'through the bore 44 and 41 andthe vent passage 47, this vent i taking the place of the passage 39described in the first for-m of the invention.

In the operation of this form of my improved valve controllingand'holecleansing means it will herein be noted that when it is desiredto cleanse the drill hole the operator manipulates the push button 59,moving the valve 57 forwardly as indicated in Fig. 4, thereby openingcommunication between the bore 11 at the rear end of the valve 17, whichbore communicates With the cylinder bore 3 by means of thethrowingpassage 23 and with the forward end of the bore 41 by means of a pipeconnection 55. Pressure fluid then flows through thethrowing passage 23,the chamber 11 at the rear end of the valve, the passage 48, chamber 49,through passage 61 in the valve 57, through the pipe connection 55, andthrough port 56 to the bore 41, the fluid in the bore 41 acting on thepiston 42, thus causing the latter to be moved rearwardly. The stem 43engages the rear end of the valve 17 at this time consequently causingthe valve 17 to be moved rearwardly against the throwing pressure and tobe held in its extreme rearward position against the rear bufer plug13.' Pressure fluid then flows from the supply passage 18 past theforward surface of the central spool of the valve and through thepassage 20 to the forward end of the cylinder bore 3. The pressure fluidacting `on the rear end of the piston 4 is exhausted to atmospherethrough the passage 19 and the passage 21 at this time. This causes thepressure fluid within the forward end of the cylinder bore to hold thepiston 4 in its extreme rearward position and pressure fluid then flowsfrom the forward end of the cylinder bore by way of the usual drillsteel rotation flutes 5 formed in the striking bar 5 through the hollowdrill steel to cleanse the drill hole. WVhen the push button 47 isreleased the pressure fluid in the forward end of the bore 41 is ventedto atmosphere by way of the vent port 62 communicating with the bore 53in the valve casng 51. Conse-` quently the spring' 45 forces the piston42 and the stem 63 forwardly to their inoperative position, the valve 17again resuming its normal fluid distributing operation at this time.

As a result of my improvement it will herein be noted that 'improvedvalveconrected through the forward end of the motor through thehollowdrill steelto cleanse the hole. It willfurther be noted thatimproved pressure fluid actuated' valve controlling and hole cleansingmeans is' provided whichis of an exceedingly simple and compactcharacter and which may be a'pplied to a drilling mechanism of standardform with a minimum of change and expense.

While I have in this application specifically described two forms whichmy invention may assume in practice, it will be understood that theseforms of the same are shown for purposes of illustration and that theinvention may be modified and embodied in various other forms withoutdeparting from its spirit or the scope of the appended claims.

What I claim as new and desire to secure by Letters Patent is: e

1.` In a rock drill, a cylinder, a piston in the cylinder, an extensionon the piston having a passage therein positionable on rearward movementof the piston to establish communication between the forward end of thecylinder and a hollow steel which is positioned for actuation by thepiston, a valve.

chest having a chamber and an inlet port, supply passages leading fromthe chamber to the cylinder on opposite sides of the piston, a

valve in the chamber controlling the distribution of pressure fluid tothe supply passages,

kicker passages leading from the valve chamber to the cylinder onopposite sides of the center thereof to control the movement of thevalve, a bore in -the valve chest, ducts leading from one end of thechamber and' from the inlet port' to the bore, a manually operable plugin the bore, said plug having a passage and ports comnunicating in oneposition of said plug with the ducts to move the valve to establishdirect communication between the inlet port and the cylinder at' thefront end thereof and through the passage in the piston extension with'a drill steel.

2. In a rock drill, a cylinder, a piston in the cylinder, an extensionon the piston having a passage therein, a valve chest having achamber,an inlet port in the valve chest in constant communication withthe chamber, supply passages leading from the chamber to the ends of thecylinder, a valve in the chamber controllng the distribution of pressurefluid from the inlet port to the supply passages, a bore in the valvechest, ducts leading from one. end of the chamber and from the inletport to the bore, crossed kicker ports leading directly from the valvechamber to the cylinder on the opposite sides of the center thereof, amanually operable plug in the bore having a passage therein to-establish direct communication between the ducts independent of thekcker ports for convey'ng pressure fluid suhstantally under full linepressure from the nlet port to the end of the chamber to hold the valvemmovable the opposte end of the chamber, and permttng an unnterruptedflow 'of pressure s fluid 'from the chamber into one end 'of the cylnderand through the passage in the eX- teson to .a drllsteel. e

In testmony whereof I affix my signature.

' ELMER G. GARTIN.

